CN111113943A - C-shaped beam forming method and C-shaped beam - Google Patents

C-shaped beam forming method and C-shaped beam Download PDF

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Publication number
CN111113943A
CN111113943A CN201811287176.4A CN201811287176A CN111113943A CN 111113943 A CN111113943 A CN 111113943A CN 201811287176 A CN201811287176 A CN 201811287176A CN 111113943 A CN111113943 A CN 111113943A
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CN
China
Prior art keywords
prepreg
shaped beam
forming
shaped
preform
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811287176.4A
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Chinese (zh)
Inventor
孔娇月
陈思
董柳杉
刘子倩
孙凯
晏冬秀
刘卫平
戎文宗
韩舒
赵科新
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Commercial Aircraft Corp of China Ltd
Shanghai Aircraft Manufacturing Co Ltd
Original Assignee
Commercial Aircraft Corp of China Ltd
Shanghai Aircraft Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Commercial Aircraft Corp of China Ltd, Shanghai Aircraft Manufacturing Co Ltd filed Critical Commercial Aircraft Corp of China Ltd
Priority to CN201811287176.4A priority Critical patent/CN111113943A/en
Publication of CN111113943A publication Critical patent/CN111113943A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28Shaping operations therefor
    • B29C70/30Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/34Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
    • B29C70/342Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28Shaping operations therefor
    • B29C70/40Shaping or impregnating by compression not applied
    • B29C70/42Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/44Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
    • B29C70/446Moulding structures having an axis of symmetry or at least one channel, e.g. tubular structures, frames
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/001Profiled members, e.g. beams, sections
    • B29L2031/003Profiled members, e.g. beams, sections having a profiled transverse cross-section

Abstract

The invention relates to the technical field of composite material forming, and discloses a C-shaped beam forming method and a C-shaped beam. The forming method of the C-shaped beam comprises the following steps: step S1: paving and sticking a prepreg on the male die, and forming the prepreg into a C-shaped preformed body; step S2: and moving the preformed body to a female die, and curing in the female die to obtain the C-shaped beam. According to the invention, the two steps of forming and curing are respectively completed by adopting different dies, the outer surface quality of the prepared C-shaped beam is good, the forming quality of the R angle of the C-shaped beam is good, and the design requirement can be met.

Description

C-shaped beam forming method and C-shaped beam
Technical Field
The invention relates to the technical field of composite material forming, in particular to a forming method of a C-shaped beam and the C-shaped beam.
Background
The existing common forming method of the composite material C-shaped beam has the defects of unsatisfactory forming quality, poor surface quality and the like. In the prior art, one of a male die 1 ' or a female die 2 ' is usually selected to form a C-shaped beam 33 ', and after a prepreg is laid on the male die 1 ' or the female die 2 ', the C-shaped beam is shaped and cured on a die tool. As shown in fig. 1, when the male mold 1 ' is selected to shape and solidify to form the C-shaped beam 33 ', the R-angle 34 ' of the C-shaped beam 33 ' has good forming quality, but the outer surface of the C-shaped beam 33 ' is rough, which is not beneficial to subsequent assembly. As shown in fig. 2, when the female mold 2 'is selected to be shaped and cured to form the C-shaped beam 33', the R-angle 34 'of the C-shaped beam 33' is not properly laid, thereby causing a bridge, and thus a void is easily formed after curing, and the inner quality is not good.
Disclosure of Invention
Based on the above, the present invention aims to provide a method for forming a C-shaped beam and a C-shaped beam, so as to obtain a C-shaped beam with high outer profile precision and good inner profile R-angle forming quality.
In order to achieve the purpose, the invention adopts the following technical scheme:
a forming method of a C-shaped beam comprises the following steps: step S1: paving and sticking a prepreg on the male die, and forming the prepreg into a C-shaped preformed body; step S2: and moving the preformed body to a female die, and curing in the female die to obtain the C-shaped beam.
As a preferable scheme of the method for forming the C-shaped beam, the step of laying the prepreg on the male die specifically includes: paving the prepreg layer by layer on a flat tool to obtain a plurality of layers of stacked prepregs; moving the stacked layers of the prepreg onto the male tool.
As a preferable aspect of the method for molding a C-shaped beam, the step of molding the prepreg specifically includes: sealing the prepreg to the male mold and evacuating, and heating the prepreg to shape the prepreg.
As a preferable scheme of the method for forming the C-shaped beam, the curing of the preform in the female die specifically includes: sealing the preform into the female mould and evacuating; and putting the preformed body and the female die into hot-pressing equipment together for curing.
As a preferable embodiment of the method for forming a C-shaped beam, before step S2, the method further includes: and calculating the contour dimension of the female die according to the expected outer profile dimension of the C-shaped beam.
As a preferable embodiment of the method for forming a C-shaped beam, before step S1, the method further includes: and calculating the contour dimension of the male die according to the expected inner profile dimension of the C-shaped beam and the expected number of the paving layers of the prepreg in the C-shaped beam.
As a preferable aspect of the method for forming a C-shaped beam, the calculating of the contour dimension of the male die specifically includes: calculating the thickness difference delta H between the pre-formed body and the solidified C-shaped beam; and the contour size of the male die is equal to the inner profile size of the pre-formed body, wherein the inner profile size of the pre-formed body is the expected inner profile size of the C-shaped beam minus the thickness difference delta H.
As a preferable scheme of the method for forming a C-shaped beam, calculating the thickness difference Δ H specifically includes: calculating the single-layer thickness difference delta before and after the pre-forming body with the single-layer pre-soaking material is cured through experimental simulation; the thickness difference delta H is the product of the single-layer thickness difference delta and the number N of the paving layers of the prepreg.
As a preferable scheme of the method for forming a C-shaped beam, calculating the single-layer thickness difference δ specifically includes: paving the prepreg layer by layer, wherein the number of trial paving layers of the prepreg is n, so that the prepreg is shaped to form a preformed sample piece, and measuring the thickness H of the preformed sample piece before curing2(ii) a Solidifying the pre-formed sample piece to form a C-shaped sample piece, measuring the thickness H of the C-shaped sample piece3(ii) a The difference delta of the single-layer thickness is the pre-forming sample piece H2Thickness of (d) and thickness H of the C-shaped sample piece3The difference of (a) is divided by the number n of trial paving layers.
The C-shaped beam is prepared and molded by the molding method of the C-shaped beam.
The invention has the beneficial effects that:
according to the invention, the prepreg is laid on the male die, so that the prepreg is attached to the male die, and the prepreg is shaped on the male die, so that the R angle forming quality of the formed preformed body is good; by moving the pre-formed body to the female die and curing the pre-formed body in the female die, the outer surface of the formed C-shaped beam is good in quality, and subsequent assembly of the C-shaped beam is facilitated. According to the invention, at different stages of the C-shaped beam forming process, different molds are adopted to complete two steps of forming and curing in sequence, so that the C-shaped beam which has good surface performance and R cutin amount and meets the design requirement is obtained.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a schematic view of a prior art C-beam formed using a male die;
FIG. 2 is a schematic view of a prior art C-beam formed using a female die;
FIG. 3 is a schematic representation of the process of laying up prepreg on a male mold provided by the present invention;
FIG. 4 is a schematic representation of a process for shaping a prepreg to form a preform provided by the present invention;
FIG. 5 is a schematic representation of the process of moving a preform provided by the present invention from a male mold to a female mold;
FIG. 6 is a schematic view of a process for curing a preform to obtain a C-beam according to the present invention;
FIG. 7 is a structural schematic diagram of C-beam springback provided by the present invention.
In the figure:
1-male die, 2-female die, 31-prepreg, 32-preformed body, 33-C beam, 34-R angle, 4-diaphragm, 5-thermal diaphragm equipment, 6-autoclave and 7-vacuum bag;
theta-rebound angle;
1 '-male die, 2' -female die, 33 '-C-shaped beam, 34' -R angle.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 3 to 6, the present embodiment provides a method of forming a C-beam and a C-beam 33 formed by the method of forming a C-beam. The forming method of the C-shaped beam comprises the following steps: step S1: laying a prepreg 31 on the male die 1, and forming the prepreg 31 into a C-shaped preform 32; step S2: the preform 32 is moved onto the female mold 2 and cured in the female mold 2, resulting in a C-beam 33.
Specifically, when the prepreg 31 is laid on the male die 1, the prepreg 31 may be directly laid on the male die 1 layer by layer to shape the prepreg 31, thereby forming the C-shaped preform 32. Alternatively, the prepreg 31 may be laid on a flat tool layer by layer to obtain a stacked multilayer prepreg 31, and then the stacked multilayer prepreg 31 is moved to the male mold 1 to complete the laying of the prepreg 31. Wherein the lay-up of prepreg 31 may be by hand lay-up or by an automatic tape laying machine. The male die 1 is adopted to directly lay and paste, so that the working procedure can be saved, and the male die is more suitable for composite material parts with smaller sizes. When the size of the composite material part is larger, the manual paving difficulty is correspondingly increased. Lay and paste preimpregnation material 31 on dull and stereotyped frock layer by layer, be applicable to automatic tape laying machine work, can reduce and spread the degree of difficulty of pasting, the application of automation equipment can also raise the efficiency, reduces intensity of labour and cost of labor. Therefore, when the size of the composite material part is large, the pre-paving and sticking can be completed on the flat tool through the automatic belt paving machine. In this embodiment, a method of laying the prepreg 31 layer by layer in a flat tool by using an automatic tape laying technique and then moving the stacked multiple layers of the prepreg 31 to the male mold 1 is adopted.
Specifically, as shown in fig. 3 to 4, when the stacked multiple layers of prepreg 31 are sealed to the male mold 1 and evacuated, the prepreg 31 should be disposed under the membrane 4 that can be stretched and deformed, both ends of the membrane 4 should be held on both sides of the male mold 1, and the space between the membrane 4 and the male mold 1 should be evacuated to completely fit the prepreg 31 to the male mold 1. Of course, in other embodiments, the prepreg 31 may be disposed between two diaphragms 4 that can be stretched and deformed, the prepreg 31 may be sealed between the two diaphragms 4, and after the space between the two diaphragms 4 is evacuated, both ends of the two diaphragms 4 may be held on both sides of the male mold 1. The prepreg 31 is heated while the space between the diaphragm 4 and the male die 1 is evacuated to completely adhere the prepreg 31 to the male die 1, and the prepreg 31 is shaped in the male die 1 to form a C-shaped preform 32. In this embodiment, the thermal diaphragm device 5 is used to perform vacuum pumping and heating, and two ends of the diaphragm 4 are held at the edge of the thermal diaphragm device 5. Of course, in other embodiments, any device that can implement the shape determination may be used. Subsequently, the preform 32 is unloaded from the male mold 1, and the membrane 4 is removed. The prepreg 31 is shaped in the male mold 1, and the resulting preform 32 has a good quality of the R-angle 34.
Specifically, as shown in fig. 6, the preform 32 is placed in the female mold 2, the preform 32 is sealed into the female mold 2 with the vacuum bag 7, and a vacuum is drawn between the vacuum bag 7 and the female mold 2. The preform 32, the vacuum bag 7 and the female die 2 are placed into a hot pressing device together for heating and pressurizing, and the preform 32 is cured in the hot pressing device to obtain the C-shaped beam 33. The vacuum bag 7 on the upper side of the C-beam 33 is removed and the C-beam 33 is detached from the female mould 2. And the C-shaped beam 33 is solidified in the female die 2, so that the outer surface quality of the formed C-shaped beam 33 is good, and the subsequent assembly of the C-shaped beam 33 is facilitated. The heating and pressurizing are performed by using the autoclave 6 in this embodiment, but in other embodiments, any device capable of performing heating and pressurizing may be used.
Further, the flat plate tool, the male die 1 and the female die 2 can be simultaneously applied to different process stages of the forming of the three C-shaped beams 33, the efficiency is improved, and the flow line production is realized.
Wherein, before the step S1, the method further includes calculating the size of the die for forming the C-shaped beam according to the size of the expected C-shaped beam 33. The method comprises the following steps: calculating the contour dimension of the female die 2 according to the expected outer profile dimension of the C-shaped beam 33; and calculating the contour dimension of the male die 1 according to the expected inner contour dimension of the C-shaped beam 33 and the expected thickness of the C-shaped beam 33. The thickness of the C-shaped beam 33 is determined by the number N of layers of prepreg 31 laid in the C-shaped beam 33.
Specifically, the difference δ in the thickness of a single layer between before and after curing of the preform 32 having the single layer prepreg 31 is measured and calculated by means of experimental simulation, and the dimension of the contour of the male mold 1 is determined by calculation. Wherein, the experimental simulation process and the composite material forming process adopt the same technological parameters. Firstly, the prepreg 31 is tentatively paved and adhered on a flat plate tool layer by layer, and the thickness of the tentatively paved and adhered prepreg 31 is H1And n layers of trial paving layers are adopted. The prepreg 31 is shaped to form a preform. Measuring the thickness H of a pre-formed sample before curing2(ii) a Subsequently, the pre-formed sample is solidified to form a C-shaped sample, and the thickness H of the solidified C-shaped sample is measured3(ii) a The single-layer thickness difference delta is the thickness H of the pre-formed sample piece before curing2And the thickness H of the solidified C-shaped sample piece3The difference of (a) divided by the number of trial paving layers is n. The thickness difference Δ H between the preform 32 and the cured C-beam 33 is the product of the single layer thickness difference δ and the number N of layers of the overlay. The inside profile dimension of preform 32 is equal to the intended inside profile dimension of C-beam 33 minus the thickness difference ah. I.e. the thickness difference deltaH is satisfiedThe following formula:the contour dimension of the male die 1 is then determined since the contour dimension of the male die 1 is equal to the inner profile dimension of said pre-form 32.
Further, as shown in fig. 7, the design of the die for C-beam molding should take into account the springback of the part. The deformation due to springback is compensated by designing the springback angle theta, the angle of the male die 1 and the female die 2 being the desired angle of the C-beam 33 plus the springback angle theta.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A forming method of a C-shaped beam is characterized by comprising the following steps:
step S1: paving a prepreg (31) on the male die (1), and forming the prepreg (31) into a C-shaped preform (32);
step S2: and (3) moving the pre-formed body (32) to a female die (2) and solidifying in the female die (2) to obtain the C-shaped beam (33).
2. The method for forming a C-beam according to claim 1, wherein the step of applying the prepreg (31) on the male die (1) comprises:
paving the prepregs (31) on a flat tool layer by layer to obtain a plurality of layers of stacked prepregs (31);
-moving the stack of plies of said prepreg material (31) onto said male mould (1).
3. The method for molding a C-shaped beam according to claim 2, wherein the shaping of the prepreg (31) specifically comprises:
sealing the prepreg (31) to the male mold (1) and evacuating, and heating the prepreg (31) to shape the prepreg (31).
4. Method for forming a C-beam according to claim 1, wherein the curing of the preform (32) in the female mould (2) comprises in particular:
sealing the preform (32) into the female mould (2) and evacuating;
and putting the preformed body (32) and the female die (2) into a hot-pressing device together for curing.
5. The method for forming a C-shaped beam according to any one of claims 1 to 4, wherein before the step S2, the method further comprises:
calculating the contour dimension of the female die (2) according to the expected outer profile dimension of the C-shaped beam (33).
6. The method for forming a C-shaped beam according to any one of claims 1 to 4, wherein before the step S1, the method further comprises:
and calculating the contour dimension of the male die (1) according to the expected inner profile dimension of the C-shaped beam (33) and the expected number N of the paving layers of the prepreg (31) in the C-shaped beam (33).
7. The method for forming a C-beam according to claim 6, wherein calculating the contour dimension of the male die (1) comprises:
calculating the thickness difference deltaH between the pre-formed body (32) and the solidified C-shaped beam (33);
the contour dimension of the male die (1) is equal to the inner profile dimension of the preform (32), wherein the inner profile dimension of the preform (32) is the expected inner profile dimension of the C-shaped beam (33) minus the thickness difference DeltaH.
8. The method of claim 7, wherein calculating the thickness difference Δ H specifically comprises:
calculating a difference δ in monolayer thickness before and after curing of the preform (32) having a single layer of the prepreg (31) by experimental simulation;
the thickness difference delta H is the product of the single-layer thickness difference delta and the number N of the paving layers of the prepreg (31).
9. The method of forming a C-beam of claim 8 wherein calculating the single layer thickness difference δ specifically comprises:
paving the prepreg (31) layer by layer, wherein the number of the trial paving layers of the prepreg (31) is n, shaping the prepreg (31) to form a pre-molded sample piece, and measuring the thickness H of the pre-molded sample piece before curing2
Solidifying the pre-formed sample piece to form a C-shaped sample piece, measuring the thickness H of the C-shaped sample piece3
The single-layer thickness difference delta is the thickness H of the pre-forming sample piece2And the thickness H of the C-shaped sample piece3The difference of (a) is divided by the number n of trial paving layers.
10. A C-beam characterized by being formed by the method of forming a C-beam according to any one of claims 1 to 9.
CN201811287176.4A 2018-10-31 2018-10-31 C-shaped beam forming method and C-shaped beam Pending CN111113943A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110588020A (en) * 2019-08-22 2019-12-20 成都飞机工业(集团)有限责任公司 Automatic tape laying method for hexagonal hole of composite material
CN113221319A (en) * 2021-03-31 2021-08-06 成都飞机工业(集团)有限责任公司 Measurement and calculation method for C-shaped composite material part curing deformation resilience angle
CN113478866A (en) * 2021-07-23 2021-10-08 航天海鹰(镇江)特种材料有限公司 Method for manufacturing omega-shaped stringer preformed body

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110588020A (en) * 2019-08-22 2019-12-20 成都飞机工业(集团)有限责任公司 Automatic tape laying method for hexagonal hole of composite material
CN113221319A (en) * 2021-03-31 2021-08-06 成都飞机工业(集团)有限责任公司 Measurement and calculation method for C-shaped composite material part curing deformation resilience angle
CN113478866A (en) * 2021-07-23 2021-10-08 航天海鹰(镇江)特种材料有限公司 Method for manufacturing omega-shaped stringer preformed body

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